FREE SHIPPING ON ORDERS OVER $49

Free Standard Shipping on orders over $49. Transaction total is prior to taxes & after discounts are applied. Due to size and/or weight, certain items bear a shipping surcharge or special handling fee, which will still apply. Savings will automatically reflect in shopping cart with the purchase of qualifying merchandise. Maximum value $75. Valid only on orders shipped within the contiguous 48 U.S. states and to military APO/FPO addresses. Offer not valid on products in the following categories: live pets; canned, fresh or frozen foods; select cat litters. Offer may not be combined with other promotional offers or discounts. Terms and conditions of this offer are subject to change at the sole discretion of PetSmart. Offer valid through February 1, 2018 at 6:30 am EST.

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Seachem Reef Advantage Magnesium is a concentrated (80,000 ppm) optimized blend of magnesium, chloride, and sulfate salts designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural sea water. This product contains no ammonia; a common contaminant in every liquid magnesium supplement on the market.

ADVANCED: Check magnesium level, then follow addition regimen above until magnesium is adjusted to 1,200â1,350 mg/L. Each 5 g/80 L will raise magnesium by about 5 mg/L. Amount or frequency can be adjusted, but do not exceed 25 g/80L per day. Thereafter, use as required to maintain magnesium.

EXPERT: After determining the magnesium depletion rate, set up a continuous drip system. Use the following formula to determine how much to add to your top-off water: g=vm/80 (g=grams to add to top off water, v=volume of tank in liters, m=amount to raise magnesium in mg/L). For example, if you want to raise magnesium by 10 mg/L in a 200 liter tank, then you would add (200x10)/80=25 g into the top-off water. [For reference: 1 gallon=3.8 liters, 5 g=1 teaspoon]. Notes: Use the Reef Status: Magnesium, Carbonate & Borate test kit to check magnesium levels.

DO NOT OVERDOSE: Excess magnesium may enhance the loss of carbonate alkalinity. Do not directly mix with any carbonate supplement. Best if magnesium & carbonate additives are added on alternate days or at least 30 minutes apart. Slight clumping of this product may be encountered but does not impact its use; any clumps will break up very easily.

5% Auto Ship - Sign up for Auto Ship and have products conveniently delivered to you at the frequency you choose! Save 5% on your initial order and 5% on recurring orders. Plus enjoy free shipping on orders over $49. Discounts will automatically apply at checkout once the customer has enrolled. Maximum value $150. Offer not valid on gift cards, gift certificates, previous purchases, or charitable donations and may not be valid on all merchandise. Offer may not be combined with other promotional offers or discounts. Terms and conditions of this offer are subject to change at the sole discretion of PetSmart.

Free Standard Shipping on orders over $49 - Transaction total is prior to taxes & after discounts are applied. Due to size and/or weight, certain items bear a shipping surcharge or special handling fee, which will still apply. Savings will automatically reflect in shopping cart with the purchase of qualifying merchandise. Maximum value $75. Valid only on orders shipped within the contiguous 48 U.S. states & to military APO/FPO addresses. Offer not valid on products in the following categories: live pets; canned, fresh or frozen foods; select cat litters. Offer may not be combined with other promotional offers or discounts. Terms & conditions of this offer are subject to change at the sole discretion of PetSmart. Offer valid on petsmart.com through February 28, 2018 @ 6:30 am EST.